Jackson Diehl

The Trump administration will put an end to the 100 years of U.S. global leadership that began in 1918. It will rend the NATO alliance, cede Eurasia to Russia and the Pacific to China, and adopt as the United States' best friends populist and authoritarian regimes that despise immigrants and globalization.

Barack Obama took office in 2009 with two big personal priorities in foreign policy: the limitation of nuclear weapons and the cause of Palestinian statehood. This summer the president has been weighing a flurry of possible last-minute actions to cement his legacy on nukes, including a U.N. resolution...

Shortly after the fall of Iraq's second-largest city, Mosul, to the Islamic State in June 2014, a delegation of senior officials from Iraqi Kurdistan visited Washington with a troubling question: From where, they asked, would the force come to retake the city? The...

If Donald Trump and Hillary Clinton really are our choices in the presidential election this fall, we'll witness an ugly debate about the great wall of Mexico, emails, Trump University and, here and there, maybe trade or torture. But we also could hear a lot about...

"The tide of war is receding," Barack Obama tirelessly insisted four years ago as he campaigned for reelection. Even then, the slogan seemed untethered from reality. Not only was fighting in Afghanistan intensifying, with no end in sight, but Syria, Iraq and...

Saudi Arabia's execution of a Shiite cleric produced a predictable explosion of sectarian enmity across the Middle East last week. Less noticed - and perhaps less excusable - was the narrow, partisan and more or less sectarian reactions it prompted in Washington....